Topochemical synthesis and magnetic properties of BaFe12O19 nanorods using α-FeOOH nanowires as templates

We present a topochemical route for the synthesis of BaFe12O19 nanorods by using hydrothermal synthesized mixture of α-FeOOH nanowires and BaCO3 as precursors. The α-FeOOH nanowires and in-situ formed BaCO3 transformed to BaFe12O19 nanorods by a two-step annealing process. The crystal structure and morphology changes of the products with annealing temperatures were investigated. BaFe12O19 nanorods with diameters of about 250 nm and lengths of about 1 μm were obtained at annealing temperature of 1000 °C. A comparison of magnetic properties between BaFe12O19 nanorods and granules was performed and discussed.